Bleaching and dyeing; fluid treatment and chemical modification – Dyeing involving animal-derived natural fiber material ,... – Hair dyeing
Reexamination Certificate
1998-11-13
2002-04-02
Einsmann, Margaret (Department: 1751)
Bleaching and dyeing; fluid treatment and chemical modification
Dyeing involving animal-derived natural fiber material ,...
Hair dyeing
C008S405000, C008S414000, C008S415000, C008S426000, C008S428000, C008S552000, C008S578000
Reexamination Certificate
active
06364913
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national stage application under 35 U.S.C. §371 of international application PCT/EP97/02280 filed May 5, 1997, the international application not being published in English.
BACKGROUND OF THE INVENTION
This invention relates to formulations for coloring and tinting keratin fibers, more particularly human hair, with a special combination of active substances.
Preparations for tinting and coloring hair are an important type of cosmetic product. They may be used to lighten or darken the natural hair color according to the wishes of the user, to obtain a totally different hair color or to cover unwanted hair colors, for example grey tones. Normal hair colorants are formulated either on the basis of oxidation dyes or on the basis of substantive dyes, depending on the required color and permanence. Combinations of oxidation dyes and substantive dyes are also used in many cases to obtain special shades.
Colorants based on oxidation dyes lead to brilliant and permanent color tones. However, they do involve the use of strong oxidizing agents, for example hydrogen peroxide solutions. This often causes damage to the hair to be colored which has to be counteracted with corresponding repair products. In addition, contact of the skin with these colorants can produce unwanted reactions in very sensitive people.
Colorants based on substantive dyes do not require oxidizing agents and can be better formulated at pH values in the vicinity of the neutral point. However, a major disadvantage of colorants based on substantive dyes is the poor fastness to washing of the colored hair. In many cases, the ability of the dye molecules to attach themselves to the hair and, in addition, the lustre of the colored hair are not entirely satisfactory.
Accordingly, there is still a need for colorants based on substantive dyes which are distinguished by improved absorption of the dye molecules onto the hair and/or by improved lustre of the colored hair.
It has now been found that the disadvantages mentioned above can be overcome to a surprisingly large extent and, in particular, the absorption of the dye molecules onto the hair and the lustre of the hair can be significantly improved with a combination of isoascorbic acid and special amino-carboxylic acids.
DESCRIPTION OF THE INVENTION
Accordingly, the present invention relates to a formulation for coloring or tinting keratin fibers, more particularly human hair, characterized in that, in addition to a substantive dye, it contains a combination of
an aminopolycarboxylic acid or a salt thereof with a physiologically compatible cation and
isoascorbic acid or a salt thereof with a physiologically compatible cation.
In the context of the invention, keratin fibers are understood to be pelts, wool, feathers and, in particular, human hair. Although the colorants according to the invention are mainly suitable for coloring keratin fibers, there is nothing in principle to stop them being used in other fields.
The active-substance combination according to the invention consists of two compulsory components.
The first component is an aminopolycarboxylic acid. An aminopolycarboxylic acid is a compound which contains at least one optionally substituted amino group and at least two carboxylic acid groups. Aminopolycarboxylic acids capable of forming chelate complexes have proved to be particularly suitable.
According to the invention, preferred aminopolycarboxylic acids are nitrilotriacetic acid, ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid and N-hydroxyethyl ethylenediamine triacetic acid. Of these compounds, ethylenediamine tetraacetic acid is particularly preferred.
The aminopolycarboxylic acids may be added to the formulations according to the invention as free acids. However, the aminopolycarboxylic acids may also be added in the form of salts with physiologically compatible cations. Such cations are, for example, alkali metal, alkaline earth metal, aluminium, ammonium and mono-, di- and trialkanolammonium ions. Alkali metal ions, particularly sodium ions, are preferred ions.
The disodium salt and, in particular, the tetrasodium salt of ethylenediamine tetraacetic acid has proved to be an eminently suitable component of the active-substance combination according to the invention.
The formulations according to the invention contain the aminopolycarboxylic acid or its salt in a quantity of preferably 0.01 to 1% by weight, based on the formulation as a whole. Quantities of 0.05 to 0.5% by weight are particularly preferred.
The second compulsory component of the active-substance combination according to the invention is isoascorbic acid or a salt thereof with a physiologically compatible cation.
The formulations according to the invention contain isoascorbic acid in a quantity of preferably 0.01 to 1% by weight, based on the formulation as a whole. Quantities of 0.05 to 0.5% by weight are particularly preferred.
The formulations according to the invention produced particularly favorable results when the quantity ratios (=ratios by weight) of aminopolycarboxylic acid and isoascorbic acid were between 2:1 and 1:2.
In addition, the formulations according to the invention contain at least one substantive dye. The substantive dye is normally selected from the group of nitrilophenylenediamines, nitroaminophenols, anthraquinones or indophenols. Corresponding compounds are, for example, the compounds known under the International names or commercial names of HC Yellow 2, HC Yellow 4, Basic Yellow 57, Disperse Orange 3, HC Red 3, HC Red BN, Basic Red 76, HC Blue 2, Disperse Blue 3, Basic Blue 99, HC Violet 1, Disperse Violet 1, Disperse Violet 4, Disperse Black 9, Basic Brown 16, picramic acid and Rodol 9 R and also 4-amino-2-nitrodiphenylamine-2′-carboxylic acid, 6-nitro-1,2,3,4-tetrahydroquinoxaline, (N-2,3-dihydroxypropyl-2-nitro-4-trifluoromethyl)-aminobenzene and 4-N-ethyl-1,4-bis-(2′-hydroxy-ethylamino)-2-nitrobenzene hydrochloride. In the context of the invention, substantive dyes also include naturally occurring dyes such as, for example, henna red, henna neutral, henna black, camomile blossom, sandalwood, black tea, black alder bark, sage, logwood, madder root, catechu, sedre and alkanet.
The substantive dyes are present in the formulations according to the invention in quantities of preferably 0.01 to 20% by weight, based on the formulation as a whole.
The formulations according to the invention may also contain oxidation dye precursors, so-called primary intermediates and secondary intermediates. The primary intermediates form the actual dyes with one another under the influence of oxidizing agents or atmospheric oxygen, optionally with the aid of special enzymes, or by coupling with one or more secondary intermediates.
The primary intermediates normally used are primary aromatic amines containing another free or substituted hydroxy or amino group in the para or ortho position, diaminopyridine derivatives, heterocyclic hydrazones, 4-aminopyrazolone derivatives and 2,4,5,6-tetraaminopyrimidine and derivatives thereof. Special representatives are, for example, p-phenylenediamine, p-toluylenediamine, 2,4,5,6-tetraaminopyrimidine, p-aminophenol, N,N-bis-(2-hydroxyethyl)-p-phenylenediamine, 2-(2,5-diaminophenoxy)-ethanol, 2-(2,5-diaminophenoxy)-ethanol, 1-phenyl-3-carboxyamido-4-amino-5-pyrazolone, 4-amino-3-methylphenol, 2-aminomethyl-4-aminphenol, 2-hydroxymethyl-4-aminophenol, 4-amino-2-(2-hydroxyethoxy)-phenol, 4-hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4-hydroxy-5,6-diaminopyrimidine and 2,5,6-triaminohydroxypyrimidine.
The secondary intermediates are generally m-phenylenediamine derivatives, naphthols, resorcinol and resorcinol derivatives, pyrazolones and m-aminophenols. Particularly suitable secondary intermediates are &agr;-naphthol, 1,5-, 2,7- and 1,7-dihydroxynaphthalene, 5-amino-2-methylphenol, m-aminophenol, resorcinol, resorcinol monomethyl ether, m-phenylenediamine, 1-phenyl-3-methyl-5-pyrazolone, 2,4-dichloro-3-aminophenol, 1,3
Hollenberg Detlef
Hurschmann Brigitta
Einsmann Margaret
Henkel Kommanditgesellschaft auf Aktien
Hild Kimberly R.
Jaeschke Wayne
Murphy Glenn E. J.
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